Need a Good Acoustic Amp in Gibson Acoustic Posted October 20, 2011 · Report reply Went to GC yesterday & played my J45 thru a few acoustic amp & really liked the new Fishman Loudbox Artist amp so decided to buy it. 120w, 2 channels, DSP effects chorus, delay etc, 8" woofer & 1" tweeter. Weighs in at about 25 lbs. Played with it some last night & sounded really nice with the J45 & my Larrivee L-03R. Like to thank everyone for their help & suggestions. Very much appreciated guys.